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Brønsted Acids in Ionic Liquids: Fundamentals, Organic Reactions, and Comparisons

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Summary.

A background for studying acids in various solvents is developed, emphasizing the importance of knowing to what extent a solvent conducts electricity and is therefore ionized, the dissociation equilibria of common molecular solvents and the acidic and basic species generated by solvent leveling. Acidity measurements in the atypical solvent water are discussed and the common method of expressing acidity in other systems – by Hammett values – is introduced. Representative examples of reactions involving Brønsted acids in ionic liquids are presented and attention paid to the questions of speciation and acidity values. It is found that the gas phase proton affinity of a base is often a better guide to the acidity of its conjugate acid in an ionic liquid than is the dissociation constant of the said acid in water.

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Authors and Affiliations

  1. Centre for Studies in Energy and Environment, Department of Chemistry, University of Regina, Regina, Saskatchewan, Canada

    Keith E. Johnson

  2. Department of Chemistry, University of Tennessee, Knoxville, Tennessee, USA

    Richard M. Pagni & John Bartmess

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  1. Keith E. Johnson
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  2. Richard M. Pagni
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  3. John Bartmess
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Correspondence to Keith E. Johnson.

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Johnson, K., Pagni, R. & Bartmess, J. Brønsted Acids in Ionic Liquids: Fundamentals, Organic Reactions, and Comparisons. Monatsh. Chem. 138, 1077–1101 (2007). https://doi.org/10.1007/s00706-007-0755-6

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